def setUp(self):
# pylint: disable=invalid-name
self.model = TestEquation.MockModel()
self.model.variables['x'] = Variable('x')
self.model.variables['y'] = Variable('y')
self.model.variables['z'] = Variable('z')
self.x = self.model.variables['x']
self.x.model = self.model
self.y = self.model.variables['y']
self.y.model = self.model
self.z = self.model.variables['z']
self.z.model = self.model
self.model.parameters['a'] = Parameter('a')
self.model.parameters['b'] = Parameter('b')
self.a = self.model.parameters['a']
self.a.model = self.model
self.b = self.model.parameters['b']
self.b.model = self.model
for var in self.model.variables.values():
_add_var_to_context(self.model._local_context, var)
for param in self.model.parameters.values():
_add_param_to_context(self.model._local_context, param)
_add_functions(self.model._local_context)
def var(self, name, desc=None, default=None):
""" Creates a variable for use within the model.
Arguments:
name: The name of the variable. This is the symbol
used in the equations.
desc: A longer description of the variable.
default: The default value of the variable, if the
value is not set.
Returns: a Variable
Raises:
DuplicateNameError:
"""
if default is None:
default = self._var_default
if name in self.variables or name in self.parameters:
raise DuplicateNameError('Name already in use: ' + name)
var = Variable(name, desc=desc, default=default)
self.variables[name] = var
var.model = self
_add_var_to_context(self._local_context, var)
self._need_function_update = True
return var
def var(self, name, desc=None, default=None):
""" Creates a variable for use within the model.
Arguments:
name: The name of the variable. This is the symbol
used in the equations.
desc: A longer description of the variable.
default: The default value of the variable, if the
value is not set.
Returns: a Variable
Raises:
DuplicateNameError:
"""
if default is None:
default = self._var_default
if name in self.variables or name in self.parameters:
raise DuplicateNameError('Name already in use: ' + name)
var = Variable(name, desc=desc, default=default)
self.variables[name] = var
var.model = self
_add_var_to_context(self._local_context, var)
self._need_function_update = True
return var
def test_equation_rewrite(self):
""" Test the equation rewriting function """
variables = dict()
variables['x'] = Variable('x')
variables['y'] = Variable('y')
self.assertEquals('x - y', _rewrite(variables, {}, 'x - y'))
self.assertEquals('xx - y', _rewrite(variables, {}, 'xx - y'))
self.assertEquals('xx - yx', _rewrite(variables, {}, 'xx - yx'))
self.assertEquals('xx(0) - yx', _rewrite(variables, {}, 'xx(0) - yx'))
self.assertEquals('_series_acc(x,-1)',
_rewrite(variables, {}, 'x(-1)'))
self.assertEquals('_series_acc(x,-t)',
_rewrite(variables, {}, 'x(-t)'))
parameters = dict()
parameters['a'] = Parameter('a')
parameters['b'] = Parameter('b')
self.assertEquals('_series_acc(a,-1)', _rewrite({}, parameters,
'a(-1)'))
def test_seriesparameter_access(self):
""" Test get/set access of value attribute """
model = TestSeriesParameter.MockModel()
varx = Variable('x', default=-1)
varx.model = model
param = SeriesParameter('a', variable=varx, iteration=-1)
self.assertEquals(-1, param.value)
self.assertEquals(model.last_variable, varx)
self.assertEquals(model.last_iteration, -1)
param = SeriesParameter('a', variable=varx, iteration=2)
self.assertEquals(2, param.value)
self.assertEquals(model.last_variable, varx)
self.assertEquals(model.last_iteration, 2)
with self.assertRaises(AttributeError):
param.value = 4
def test_illegal_names(self):
""" Test for illeagl name handling """
for name in Variable.ILLEGAL_NAMES:
with self.assertRaises(InvalidNameError) as context:
Variable(name)
self.assertEquals(name, context.exception.name)
